Vibratory disk



P. LACHMAN AND G. THOMAS.

VIBRATORY DISK.

APPLICATION FILED MAR. 5. 1919.

1,336,036. P tented Apr. 6, 1920.

WITNESSES LA cHM/Zlff/VTORS 7 PHIL IPP 6E0. Tram/WA A TTORNE Y8 PHILIPP LACHMAN AND GEORGE THOMAS, 0F RAHWAY, NEW JERSEY.

VIBRATORY DISK.

Specification of Letters Patent.

Patented Apr. 6, 1920.

Application filed March 5, 1919. Serial No. 280,850.

To all whom it may concern:

Be it known that we, PHILIPI LAoni AN and GEORGE THOMAS, citizens of the United States, and residing at Rahway, in the county of Union and State of New Jersey, have invented certain new and useful Im provements in Vibratory Disks, of which the following is a specification.

Our invention has reference to musical and other instruments wherein a vibratory disk or diaphragm is used, and relates more particularly to the disk itself and its mount- 111S.

in object of our invention is to provide means whereby the vibration of the disk or diaphragm of a talking machine can be readily controlled and regulated.

With this and other objects in view our invention consists in certain novel features of construction, arrangement and combination of parts as will be hereinafter more fully set forth and pointed out in the claims, reference being had to the accompanying drawings in which-r Figure 1 is a top plan view of a phonograph sound box, partly broken away, and showing application of the invention;

Fig. 2 is a plan view of the control wheel;

Fig. 3 is a cross section of such wheel;

Fig. 1 is a fragmentary plan view of the vibratory disk or diaphragm;

Fig. 5 is a cross section of same;

Fig. 6 is an edge view of one of the control rings;

Fig. 7 is a face view of same;

Fig. 8 is an edge view of the other centrol ring;

Fig. 9 is a face view of same;

Fig. 10 is a side elevational sectional view of the soundbox, showing connection of stylus bar with diaphragm;

Fig. 11 is a plan view of the tension screw;

Fig. 12 is a central vertical section of same.

As shown in Fig. 1 A represents a disk or diaphragm which is mounted in soundbox B to whichthe stylus bar C is pivoted; this stylus-bar at its opposite end is connected to the central portion of disk A. A control wheel D is provided having at its center a hub d, the bore of which is internally threaded as indicated by d, the purpose or which will later appear. Said control wheel D comprises also a rim 2 having perforations R therethrough, said rim bemgconnected with the hub by fiat spokes or spiders 3 provided with radial slots 9 within which are slidably mounted tension devices consisting of washer or button heads E adapted to engage the disk A and the shanks e which extend upwardly through the slots 9 with their upper ends projected above the face of control wheel D.

The holes R in the rim 2 of wheel D are drilled equidistant apart and correspond in number and vertical alinement with similar openings in the disk or diaphragm, and they fit snugly the stud rivets I which also pass through ring washers H interposed between said control wheel D and the disk A, the opening U in said washers having a drawing fit on the said stud rivets, the thickness of said washers being such as to afford sufficient space between the under surface of the wheel D and the face of the disk A for sliding movement of the heads E of the tensioning buttons, said buttons being moved and set at any desired radius by the free end of the shanks which extend above the upper surface of the said control wheel D.

The stylus-bar C is provided with a control pin m driven laterally through the bent portion 0 and parallel with the face of disk A, the said pin being located to extend across the center of the said disk.

The control wheel is also provided with a tension bushing L which has a reduced threaded stem which is screwed into the internal threads 03 of the hub of the wheel;

the bushing Lhas a dished'upper face and the central bore 1) through which is passed the end 0 of the stylus-bar, and which end is secured to the center of the disk A; this opening p is designed also to permit adjustment of the threaded bushing L the periphery of which is knurled as indicated by V. The upper surface of the tension bushing L engages at all time with the transverse control pin m so that more or less tension between the stylus-bar C and the disk A can be maintained continuously through the medium of the control wheel D.

The sound box B is provided with an elongated slot K in its side wall 00 and at a level even with the usual shoulder 7. At the circumference of the disk A which is made somewhat large for our purpose, are placed the control rings F and (T, the ring F being superposed on ring G with the extension finger 5 projecting through theslot I: in the wall of the sound box, and between the thin superposed rings and the disk A. near its circumference is placed the usual rubber ring or gasket 8, another EIHL similar gasket 8 being placed below the disk A.

As stated the lateral extension linger projects through the slot K and is adapte to be moved horizontally therein, the rin; F being also provided with rounded projections 4 on its under face, which are arranged equidistantly apart. The bottom ring G is provided with a peripheral tongue 9 which is of such width as to fit loosely in the slot K, the purpose of said tongue being to prevent turning movement of the ring within the wall :0 and insure the resilient action of the same when arranged upon the usual rubber ring 8 hereinbefore referred. That portion of the ring G within the sound box B is provided with holes 1 drilled equidistant apart and corresponding in number with the rounded projections i on the under face of ring F such projections being adapted to fit into said open rings 1.

From the above it will be evident that with rings F and G arranged in the sound-- box as shown in Fig. 10, that by lateral movement of the finger 5 back and. forth in the slot K, the projections A on the rin F will be alternately moved into and out of holes 1 in ring G, and thus the opposing faces of rings F and G be separated and brought together to increase and decrease pressure on disk or diaphragm at or near its circumference, thereby altering the volume and pitch at one and same time as desired by the operator.

From the above it will be seen that the tension of the diaphragm may be varied by the tension screw bushing L, by the shdable buttons E, rotary movement of the rings F and G, and by the control wheel 1'), and the vibrations of the diaphragms better controlled and regulated.

What we claim as our invention and de sire to protect by Letters Patent is-- 1. In a device as herein clniracterized the combination with a vibratory diaphragm, of a control wheel including a hub having threaded bore, tension screw bushing having threaded engagement in said bore, spokes radiating from said hub and connected to a circular rim, said spokes having radial slots therethrough, tension buttons slidably mounted in said slots and hating sliding contact with said diaphragm, said rim spaced from said diaphragm, but rigidly connected therewith, substantial v as forth and for the purpose specilicc.

2. In a device as herein characterized, combination, a sounding box, a vibratory diaphragm mounted therein, a stylus-bar pivotally mounted on said sounding box, and having one end connect-ed to said diaphragm at its center, said end provided with a transverse control pin, the wall of said sounding box having a slot therethrough, a ring having equidistant openings therethr-ough and a tongue projecting peripherally therefrom into said slot, a second ring superposed on said first named ring and provided with projections on its lower face dapted to contact with the face of the lower ring and to also seat in the aforesaid openings therein, and a lateral linger projecting from the upper ring and through the slot in the soundbox wall, whereby pressure and tension on the diaphragm adjacent its circumference may be regulated.

3. In a device as herein characterized, the combination with a sound box, a diaphragm mounted therein, a stylus bar connected with the diaphragm, and a radially slotted frame supported on said diaphragm, of damper means slidably mounted in said slots to enthe upper face of the diaphragm along radial lmes to and from its center.

d. In a device as herein characterized the combination of a soundbox, a diaphragm or disk therein, a stylus lever connected to said diaphragm and means for securing and maintaining uniform pressure upon the diaphragm in zones around the point of connection of said disk and stylus needle.

5. In a device as herein characterized, the combination of a soundbox, a diaphragm mounted therein, a stylus lever connected to the diaphragm, pressure rings adjacent the periphery of said diaphragm, and means for applying pressure to said diaphragm adjacent its periphery through relative rotary movement of said pressure rings.

6. In a device as herein characterized, the combination of a soundbox, a diaphragm therein, a stylus lever connected to the diaphragm, a pair of superposed pressure rings supported on said diaphragm adjacent its periphery, and means for applying pressure to the diaphragm by a rotary movement of said pressure ring.

7. In a device as herein characterized, the combination of a soundbox, a diaphragm therein, a stylus lever connected to the dia phragm, superposed pressure rings engaging adjacent the periphery of the diaphragm, and means carried by said rings whereby pressure on the diaphragm adjacent its periphery may be varied, as desired but maintained even throughout the entire bearing surface of the diaphragm.

8. In a device as herein characterized, the combination of a sound box, a diaphragm therein, pressure rings mounted on the diaphragm at its periphery, and cooperating means carried by said rings whereby relative circular movement thereof will apply and relieve pressure evenly as to the diaphragm at its periphery.

9. In a device as herein characterized, the

combination of a soundbox, a diaphragm mounted therein, a stylus lever connected to said diaphragm, and means mounted on said stylus lever for regulating the pressure of said lever on the diaphragm at its center.

10. In a device as herein characterized, the combination of a soundbox, a diaphragm mounted therein, a stylus lever connected to said diaphragm, and means for varying the pressure of said lever on the diaphragm, said means including a frame offset from the diaphragm above the same and connected thereto, a central opening in said frame, and an adjustable bushing mounted in said central opening and in engagement with the said stylus lever.

11. In a device as herein characterized the combination of a soundbox, a diaphragm mounted therein, a stylus lever connected to the diaphragm, a circular frame oifset from the diaphragm, above the same and rigidly connected thereto, a hub portion carried by the frame, a rim member, and spokes connecting the rim and the hub,'said spokes having radial slots therethrough between the hub and rim, and pressure buttons slidably mounted in said radial slots, the heads of said buttons bearing on the diaphragm and movable radially thereover.

PHILIPP LACHMAN. GEORGE THOMAS. Witnesses WILLIAM SONNABEND, Jnssm E. THOMAS. 

